<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<script language="javascript">
function jisuan(){
        var code = document.form1.textfield.value;
        for (var i = 0; i < 100; i++) {
                var text = (code * 3).toString() 
                if (text.Length <= 12) {
                        code = parseInt(text);
                } else {
                        code = text.substring(0, 12);
                }
        }
        document.form2.textfield2.value = code;
}
</script>
<title>北&斗&PDF转换器-注册机</title>
</head>
 
<body>
<table width="332" border="1">
  <tr>
    <td width="141">机器码：</td>
    <td width="175"><form id="form1" name="form1" method="post" action="">
      <label>
        <input type="text" value="1271721233" name="textfield" />
        </label>
    </form>
    </td>
  </tr>
  <tr>
    <td>注册码是：</td>
    <td><form id="form2" name="form2" method="post" action="">
      <label>
        <input type="text" name="textfield2" />
        </label>
    </form>
    </td>
  </tr>
</table>
<input type="button" onclick=" jisuan()" name="Submit" value="提交">
</body>
</html>